題目：Phase-field for 2D materials

報告人：胡知力 博士 (航空宇航學院 航空航天交叉研究院)

時間：2017年6月7日（星期三）10:10 AM

地點：明故宮校區A18-209

主辦單位：科協、航空宇航學院、航空航天交叉研究院

報告摘要：

    Since the discovery of graphene, 2D materials attracted intense interest to the research circle. Growth by chemical vapor deposition is currently the most important way to obtain 2D materials.Thethe grown 2D materials has a dazzling diversity of morphologies.Take graphene for example, the observed shapes include not only hexagons, but also dodecagons, pentagons, snow flakes,gears, circles,seaguls,rectangles and even more. Meanwhile, explanations to many of these morphologies still remain challenging.

    In this talk, we try to solve the challenges aided by the phase-field method. Phase-field method is a tool that can easily simulate morphology evolution of crystals, including those are 2D.We introduce principles of the method. A series of recent works will be presented as examples to show the power of this method.These works include the explanation of shapes of MoS2, SnSe2, dodecagon graphene, truncatedtriangle shapes of MX2,shapes of 2D materials on a cone, and the effect of temperature on the dendricity of 2D grains.

報告人簡介：

胡知力，現任南京航空航天大學講師，航空宇航學院特聘副研究員。2012年博士生畢業于瑞典查爾摩斯理工大學，獲博士學位；2013年畢業于上海大學力學所，獲工學博士學位。之后也曾在Rice大學獲得BI Yakobson教授指導。主要從事納米力學和二維材料形態方面的研究。其中在納米力學方面主要使用板殼力學、分子動力學等方法研究納米材料的振動、屈曲等性質。在二維材料形態研究方面主要采用經典生長理論結合相場方法和密度泛函理論進行研究。納米力學和二維材料形態的結合研究是近期一個主要的發展方向。